vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

Yimiprod

/**
 * This code is licensed under the terms of the MIT license
 *
 * Deep diff between two object, using lodash
 * @param  {Object} object Object compared
 * @param  {Object} base   Object to compare with
 * @return {Object}        Return a new object who represent the diff
 */
function difference(object, base) {
	function changes(object, base) {

revolunet

Shell edition

• Ctrl + a – go to the start of the command line
• Ctrl + e – go to the end of the command line
• Ctrl + k – delete from cursor to the end of the command line
• Ctrl + u – delete from cursor to the start of the command line
• Ctrl + w – delete from cursor to start of word (i.e. delete backwards one word)
• Alt + b – move backward one word (or go to start of word the cursor is currently on)
• Alt + f – move forward one word (or go to end of word the cursor is currently on)

anandsunderraman

//import the selenium web driver
var webdriver = require('selenium-webdriver');

var chromeCapabilities = webdriver.Capabilities.chrome();
//setting chrome options to start the browser fully maximized
var chromeOptions = {
    'args': ['--test-type', '--start-maximized']
};
chromeCapabilities.set('chromeOptions', chromeOptions);
var driver = new webdriver.Builder().withCapabilities(chromeCapabilities).build();

ramseyp

<?php

/**
 * Hide editor on specific pages.
 *
 */
add_action( 'admin_init', 'hide_editor' );

function hide_editor() {
  // Get the Post ID.

andsens

#!/bin/sh
## backup each mysql db into a different file, rather than one big file
## as with --all-databases. This will make restores easier.
## To backup a single database simply add the db name as a parameter (or multiple dbs)
 
## Putting the script in /var/backups/mysql seems sensible... on a debian machine that is
## Create the user and directories
# mkdir -p /var/backups/mysql/databases
# useradd --home-dir /var/backups/mysql --gid backup --no-create-home mysql-backup
## Remember to make the script executable, and unreadable by others

Adirael

#!/bin/bash
#
# This script configures WordPress file permissions based on recommendations
# from http://codex.wordpress.org/Hardening_WordPress#File_permissions
#
# Author: Michael Conigliaro <mike [at] conigliaro [dot] org>
#
WP_OWNER=www-data # <-- wordpress owner
WP_GROUP=www-data # <-- wordpress group
WP_ROOT=$1 # <-- wordpress root directory